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11 21 531 Replacing all crankshaft main bearings (N12)

WARNING: This page is about a different variant/trim than selected.
IMPORTANT: Modified assignment of bearing positions.
Bearing position (1) is at the output end (clutch end)
Determine main bearing colors; the designations on the crankcase and crankshaft are always required and can only determined using the table.

Necessary preliminary work: 

Installation note: 

Bearing shell (1) with lubricating groove must be fitted in crankcase upper part.

Bearing shell (2) without lubricating groove must be fitted in crankcase lower section (bedplate).

Fig 1: Identifying Bearing Shell With/Without Lubricant Groove
G04751107Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: Modified assignment of bearing positions.
Bearing position (1) is at the output end (clutch end)

Bearings (1 to 5).

Bearing (2) is a guide bearing.

IMPORTANT: Clean sealing surfaces.
Do not  clean sealing surfaces with a metal-cutting tool.

Only use special tool 11 4 470 to clean sealing surfaces.

Fig 2: Identifying Bearings
G04796207Courtesy of BMW OF NORTH AMERICA, INC.

Insert guide rings (1) in crankcase at bearing seat (2) with groove facing outwards.

If necessary, attach with engine oil to crankcase.

Fig 3: Identifying Crankcase Guide Rings
G04789742Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: Modified assignment of bearing positions.
Bearing position (1) is at the output end (clutch end)

Bearings (1 to 5).

IMPORTANT: Clean sealing surfaces.
Do not  clean sealing surfaces with a metal-cutting tool.

Only use special tool 11 4 470 to clean sealing surfaces.

Fig 4: Identifying Bearing
G04796209Courtesy of BMW OF NORTH AMERICA, INC.

Bearing classification on crankcase upper part 

Bearing allocation 1 - 5: the designations on the crankcase and crankshaft are always required.

Example: 

Lager 1. Letter P

Lager 2. Letter K

Lager 3. Letter I

Lager 4. Letter N

Lager 5. Letter N

Fig 5: Identifying Bearing Color Code Mark
G04796210Courtesy of BMW OF NORTH AMERICA, INC.

Bearing classification on crankcase upper part 

Bearing allocation 1 - 5: the designations on the crankcase and crankshaft are always required. 

Example: 

Lager 1. Letter T

Lager 2. Letter Q

Lager 3. Letter Q

Lager 4. Letter R

Lager 5. Letter R

Fig 6: Identifying Letters Of Crankcase Bearing
G04796211Courtesy of BMW OF NORTH AMERICA, INC.
CODE LETTER OF CRANKSHAFT

Table overview of bearing classification: upper part
Code letter of crankshaft
Bearings 1 - 5 A  B  C    E  G  H  I  K  M  N  P  q  R  S  T  U 
Crankcase  A  Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl Bl Bl Bl
B  Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl Bl Bl
C  Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl Bl
  Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl
E  Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw
G  Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw
H  Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw
I  Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw
K  Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw
M  Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw
N  Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw
P  Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw
q  Or Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr
R  Or Or Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr
S  Or Or Or Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr
T  Or Or Or Or Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr
U  Or Or Or Or Or Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr
X  Or Or Or Or Or Or Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr
Y  Or Or Or Or Or Or Or Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr
Z-Series  Or Or Or Or Or Or Or Or Ge Ge Ge Ge Ge Ge Ge Ge Gr

Crankshaft bearing colors:

BL= Blue.

SW= Black.

Gr= Green.

Ge Yellow.

Or Orange.

Bearing classification on crankcase lower section 

Bearing allocation 1 - 5: the designations on the crankcase and crankshaft are always required.

Example: 

Lager 1. Letter P

Lager 2. Letter K

Lager 3. Letter I

Lager 4. Letter N

Lager 5. Letter N

Fig 7: Identifying Bearing Color Code Mark
G04796210Courtesy of BMW OF NORTH AMERICA, INC.

Bearing classification on crankcase lower section 

Bearing allocation 1 - 5: the designations on the crankcase and crankshaft are always required.

Example: 

Lager 1. Letter T

Lager 2. Letter Q

Lager 3. Letter Q

Lager 4. Letter R

Lager 5. Letter R

Fig 8: Identifying Letters Of Crankcase Bearing
G04796211Courtesy of BMW OF NORTH AMERICA, INC.
CODE LETTER OF CRANKCASE BEARING

Table overview of bearing classification: lower section
Crankshaft
Bearings 1 - 5 A  B  C    E  G  H  I  K  M  N  P  q  R  S  T  U 
Crankcase  A  Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl Bl Bl Bl Bl Bl Bl Bl
B  Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl Bl Bl Bl Bl Bl Bl
C  Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl Bl Bl Bl Bl Bl
  Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl Bl Bl Bl Bl
E  Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl Bl Bl Bl
G  Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl Bl Bl
H  Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl Bl
I  Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl
K  Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw
M  Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw
N  Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw
P  Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw
q  Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw
R  Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw
S  Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw
T  Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw
U  Or Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr
X  Or Or Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr
Y  Or Or Or Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr
Z-Series  Or Or Or Or Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr

Crankshaft bearing colors:

BL= Blue.

SW = Black.

Gr = Green.

Ge = Yellow.

Or = Orange.

Example: Crankcase upper part 

Combining the dots of the designations of the crankshaft and crankcase produces the following color combinations.

Bearing 1: The letters (P and T) produce in the crankcase upper part the color Ge= Yellow with lubricating groove.

Bearing 2: K and Q= Ge= Yellow.

Bearing 3: I and Q= Ge= Yellow.

Bearing 4: N and R= Gr= Green.

Bearing 5: N and R= Gr= Green.

Fig 9: Identifying Bearings
G04796207Courtesy of BMW OF NORTH AMERICA, INC.

Example: Crankcase lower section 

Combining the dots of the designations of the crankcase and crankshaft produces the following color combinations.

Bearing 1: The letters P. and T. produce in the crankcase lower section the color Gr= Green without lubricating groove.

Bearing 2: K and Q = Gr = Green.

Bearing 3: I and Q= Gr= Green.

Bearing 4: N and R= Gr= Green.

Bearing 5: N and R= Gr= Green.

Fig 10: Identifying Bearings
G04796209Courtesy of BMW OF NORTH AMERICA, INC.

Install CRANKCASE LOWER SECTION  .

Assemble engine.

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